Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505c5d658a911af0668ffb02f0b1c1e7866feb9fc953f280f498553d50bed6c6' 
  AND token = 'mVqc8FvWxbgRZlHUmGddXF9O4nrkZrS9SlHkQi2KYv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables